I'm working on a project where I need to convert from pixels to mm and need to find the aperture or sensor size on the FaceTime HD Camera. Specifically, I have the mid-2011 27" iMac. I can't seem to find any detailed technical specifications on the newer FaceTime camera. Anyone privy to these details?

If you use the camera to take a picture of a ruler, you can then measure the distance between the glass covering the camera and the ruler to make a start on your project. However, unless you are controlling for the 3D position and alignment of whatever you are measuring, you might find distortion and off-axis positioning have measurable effects on the image rendering even assuming you have a parallel placement of whatever you are measuring (both vertically and horizontally).
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bmike♦Mar 11 '13 at 12:54

I'm using OpenCV for the project. Specifically, I'm looking to find the apertureWidth and apertureHeight parameters for the calibrationMatrixValues. Rereading the documentation, it looks as though these parameters are poorly named as they're actually looking for the physical width and height of the sensor.
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bjornsenMar 11 '13 at 14:39